2015 USACE NAE Topobathy Lidar: Connecticut Point Cloud files with Orthometric Vertical Datum North American Vertical Datum of 1988 (NAVD88) using GEOID18

Below are links to the files that make up the 2015 USACE NAE Topobathy Lidar: Connecticut dataset in an orthometric vertical datum North American Vertical Datum of 1988 (NAVD88) using GEOID18. This HTML file is here to emulate the access you would have gotten through an ftp site. The files containing geospatial indices, metadata, etc., are listed first, followed by the files. To download in bulk, it is suggested you use a program such as wget (example below). The geospatial index file in shapefile format also has a URL attribute that some GIS programs can use to download files. You can also subset the data, make derived products, and change projection, datum, etc., using the Digital Coast Data Access Viewer (add to cart, the link to bulk download or LAZ fmt will take you here).

The files are in LAZ format, a lossless compressed version of the ASPRS LAS format. The compression and decompression is done with the free and open source 'laszip' program available at https://laszip.org. This is not the same as the more general zip format. Many geospatial programs will read LAZ files natively and decompression is often not necessary. There is a list of software with native support on the laszip site.

There are many download managers you can use to get all the data. An example is the uGet program using the list of URLs in file urllist4981.txt. Several posts on the GeoZone blog provide help with downloading, including:

The total size to download all the files is 1002M. There are 28 LAZ files and the summary class table is:
Class NumberClass NamePoints
1Unclassified135425451
2Ground30799397
29Bathymetric point64681939

Georeferencing Note

You may find the georeferencing on the files refers to generic NAD83 (EPSG code 4269). All files, with the exception of the few in WGS84, are in a more recent realization of NAD83 such as NAD83(CORS96), NAD83(HARN), NAD83(NSRS2007), or NAD83(2011).

Cloud Access

This data is now in an AWS S3 bucket at s3://noaa-nos-coastal-lidar-pds/laz/geoid18/4981.

Meta Info

Tile Index: tileindex.zip (Shapefile)
                ct2015_usace_nae_ct_index.gpkg (GeoPackage)
Metadata: ct2015_usace_nae_ct_metadata.xml
Metadata: ct2015_usace_nae_ct_metadata.html
XYZ range table: ct2015_usace_nae_ct_minmax.csv
README: 0README.txt (contains similar information to above)
URL List: urllist4981.txt is a list of all the URLs for batch downloading.

Supplemental Info

supplemental/ct2015usace_nae_ct_m4981.kmz
supplemental/index.html

Point Clouds

NAE_WestportHarbor_CT_41073a3c.laz
20150610_NAE_Bridgeport_CT_41073b2a.laz
20150613_NAE_ConnRiver_CT_41072g6a.laz
20150613_NAE_ConnRiver_CT_41072f6b.laz
20150610_NAE_Bridgeport_CT_41073b1d.laz
20150608_NAE_SaybrookJetties_CT_41072c3d.laz
20150612_NAE_StamfordHarbor_CT_41073a5d.laz
20150612_NAE_StamfordHarbor_CT_41073a5a.laz
20150608_NAE_DuckIs_CT_41072c5a.laz
20150612_NAE_StamfordHarbor_CT_40073h5c.laz
20150612_NAE_SouthportHarbor_CT_41073b3a.laz
20150612_NAE_SouthportHarbor_CT_41073a3b.laz
20150612_NAE_Bridgeport_CT_41073b2d.laz
20150611_NAE_SearShoalsDike_CT_41072e5a.laz
20150608_NAE_DuckIs_CT_41072c4d.laz
20150608_NAE_DuckIs_CT_41072b5b.laz
20150605_NAE_Stonington_CT_02.laz
20150610_NAE_ThamesRiver_CT_41072e1d.laz
20150610_NAE_ThamesRiver_CT_41072d1c.laz
20150605_NAE_Stonington_CT_01.laz
20150610_NAE_Shelton_CT_41073c1d.laz
20150610_NAE_Shelton_CT_41073c1c.laz
20150610_NAE_NewHaven_CT_41072c8a.laz
20150610_NAE_NewHaven_CT_41072c7d.laz
20150610_NAE_NewHaven_CT_41072b8c.laz
20150610_NAE_NewHaven_CT_41072b8b.laz
20150610_NAE_NewHaven_CT_41072b7c.laz
20150610_NAE_MilfordHarbor_CT_41073b1b.laz

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